Android Accelerometer-Daten speichern in Datei
Ich Schreibe eine app, in der ich zum speichern der Daten in einer Datei für die accelerometer-Werte. Wie mache ich das ? Ich muss eine Datei erstellen, die nur einmal, und fügen Sie die Daten in dieser Datei. Dies ist der flow der Anwendung:
- Benutzer klicken Sie auf start-Taste, sollten Sie beginnen, das schreiben von sensor-Daten-Datei.
- Benutzer klicken Sie auf stop-Taste, es sollte aufhören, das schreiben der Daten in die Datei.
Plz help ..
Edit 1: code nach @iTech, aber es keine Daten Anhängen.
import java.io.*;
import java.util.ArrayList;
import java.util.List;
import app.AccelLocData;
import com.google.android.gms.maps.*;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Dialog;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapViewActivity extends Activity implements LocationListener,
SensorEventListener, OnClickListener {
GoogleMap googleMap;
private boolean started = false;
private ArrayList<AccelLocData> sensorData;
private SensorManager sensorManager;
private Button btnStart, btnStop;
private String provider;
File root, dir, sensorFile;
FileOutputStream fOut;
//ObjectOutputStream myOutWriter;
private Sensor mAccelerometer;
private FileWriter writer;
//private Button btnUpload;
@SuppressLint("NewApi")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
root = android.os.Environment.getExternalStorageDirectory();
dir = new File(root.getAbsolutePath() + "/myapp");
dir.mkdirs();
File oldFile = new File(dir, "data.txt");
boolean deleted = oldFile.delete();
System.out.println("Delete status = " + deleted);
sensorFile = new File(dir, "data.txt");
sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mAccelerometer = sensorManager
.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
btnStart = (Button) findViewById(R.id.btnStart);
btnStop = (Button) findViewById(R.id.btnStop);
btnStart.setOnClickListener(this);
btnStop.setOnClickListener(this);
btnStart.setEnabled(true);
btnStop.setEnabled(false);
int status = GooglePlayServicesUtil
.isGooglePlayServicesAvailable(getBaseContext());
if (status != ConnectionResult.SUCCESS) { //Google Play Services
//are
//not available
int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status,
this, requestCode);
dialog.show();
} else { //Google Play Services are available
//Getting reference to the SupportMapFragment of
//activity_main.xml
//SupportMapFragment supportMapFragment = (MapFragment)
//getFragmentManager().findFragmentById(R.id.map);
//Getting GoogleMap object from the fragment
googleMap = ((MapFragment) getFragmentManager()
.findFragmentById(R.id.map)).getMap();
//googleMap = supportMapFragment.getMap();
//can use for overlay on the map
List<Double> latList = new ArrayList<Double>();
latList.add(45.7309593);
latList.add(46.34);
latList.add(47.34);
List<Double> lonList = new ArrayList<Double>();
lonList.add(-122.6365384);
lonList.add(-123.6365384);
lonList.add(-124.6365384);
for (int i = 0; i < 3; i++) {
//LatLng latLng = new LatLng(45.7309593, -122.6365384);
LatLng latLng = new LatLng(latList.get(i).doubleValue(),
lonList.get(i).doubleValue());
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
googleMap
.addMarker(new MarkerOptions()
.position(latLng)
.title("My Spot")
.snippet("This is my spot!")
.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
}
googleMap.setOnMapClickListener(new OnMapClickListener() {
@Override
public void onMapClick(LatLng latLng) {
//Creating a marker
MarkerOptions markerOptions = new MarkerOptions();
//Setting the position for the marker
markerOptions.position(latLng);
//Setting the title for the marker.
//This will be displayed on taping the marker
markerOptions.title(latLng.latitude + " : "
+ latLng.longitude);
//Clears the previously touched position
googleMap.clear();
//Animating to the touched position
googleMap.animateCamera(CameraUpdateFactory
.newLatLng(latLng));
//Placing a marker on the touched position
googleMap.addMarker(markerOptions);
}
});
//Enabling MyLocation Layer of Google Map
googleMap.setMyLocationEnabled(true);
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, true);
Location location = locationManager
.getLastKnownLocation(provider);
if (location != null) {
onLocationChanged(location);
}
locationManager
.requestLocationUpdates(provider, 20000, 0, this);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void onSensorChanged(SensorEvent event) {
if (started) {
double x = event.values[0];
double y = event.values[1];
double z = event.values[2];
long timestamp = System.currentTimeMillis();
LocationManager locManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setPowerRequirement(Criteria.POWER_MEDIUM);
criteria.setAccuracy(Criteria.ACCURACY_FINE);
provider = locManager.getBestProvider(criteria, true);
Location location = locManager.getLastKnownLocation(provider);
double latitude = 0;
double longitude = 0;
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
AccelLocData data = new AccelLocData(timestamp, x, y, z, latitude,
longitude);
System.out.println("data x:" + data.getX());
try {
writer.write(data.toString());
} catch (IOException e) {
//TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
public void onLocationChanged(Location location) {
TextView tvLocation = (TextView) findViewById(R.id.tv_location);
//Getting latitude of the current location
double latitude = location.getLatitude();
//Getting longitude of the current location
double longitude = location.getLongitude();
//Creating a LatLng object for the current location
LatLng latLng = new LatLng(latitude, longitude);
//Showing the current location in Google Map
googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
//Zoom in the Google Map
googleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
//System.out.println("Latitude:" + latitude + ", Longitude:" +
//longitude);
//Setting latitude and longitude in the TextView tv_location
//tvLocation.setText("Latitude:" + latitude + ", Longitude:" +
//longitude);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnStart:
btnStart.setEnabled(false);
btnStop.setEnabled(true);
System.out.println("cam on click of start");
started = true;
sensorManager.registerListener(this, mAccelerometer,
SensorManager.SENSOR_DELAY_FASTEST);
break;
case R.id.btnStop:
try {
btnStart.setEnabled(true);
btnStop.setEnabled(false);
//btnUpload.setEnabled(true);
started = false;
sensorManager.unregisterListener(this);
/*
* if(writer != null) { try { writer.close(); } catch
* (IOException e) { //TODO Auto-generated catch block
* e.printStackTrace(); } }
*/} catch (Exception e) {
e.printStackTrace();
}
break;
default:
break;
}
}
protected void onPause() {
super.onPause();
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
//TODO Auto-generated catch block
e.printStackTrace();
}
}
}
protected void onResume() {
super.onResume();
try {
System.out.println("called onresume");
writer = new FileWriter(sensorFile, true);
} catch (IOException e) {
//TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void onProviderDisabled(String arg0) {
//TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
//TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
//TODO Auto-generated method stub
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
//TODO Auto-generated method stub
}
}
Du musst angemeldet sein, um einen Kommentar abzugeben.
Hier ist ein Beispiel-code für Sie, um loszulegen.
Können Sie überprüfen, android Muster zu lernen, wie zu Lesen, die Daten von sensoren und schreiben es in eine Datei.
Um diesen code auszuführen, müssen Sie zwei Tasten und Ihre
onClick
zuonStartClick
undonStopClick
. Auch können Sie die Ausgabe-Datei-Pfad auf der SD-Karte.Log.d()
nichtSystem.out
. Ich sehe nicht, etwas eindeutig falsch in Ihrem code. Es kann hilfreich sein, um das hinzufügen anderen Fall in IhreonSensorChanged
um sicherzustellen, dass diestart
Wert richtig eingestellt ist, umtrue